Pre-Linguistic sign behavior in chimpanzee /
Yerkes, Robert M.
Pre-Linguistic sign behavior in chimpanzee / Robert M. Yerkes and Henry W. Nissen - [S.l. : s.n.], 1939 - 7 p. ; 27 cm - Science ; 89 .
Pre-Linguistic sign behavior in chimpanzee / Robert M. Yerkes and Henry W. Nissen - [S.l. : s.n.], 1939 - 7 p. ; 27 cm - Science ; 89 .